I purchased mine for the specific purpose of configuring a new BCM. I took it to dealership to do, as I was told it's something they have to install. Come to find out, it's just for the BCM restraint ID stuff. When I called them back a few months later (I was busy troubleshooting my new airbag/TC lights) and told them that I needed them to finish the job, and provided the SB to them stating this is an issue, she became aggressive and refused to finish it without me paying diag due to it being so long, the tech not remembering what he did, the OTHER tech only knowing how to use MDI, and the fact that I had "aftermarket electronics".. which was an aftermarket headunit.It will absolutely be worth the investment. I've saved literally thousands of dollars in diagnostics and repairs, being able to zero in and identify the sources of issues that pop up from time to time and then repair them myself.
Once I decided I was sick of her yelling at me and that Dave Cross GMC in Lee's Summit, MO can suck all the dicks, I bought one myself. I'm hoping I can figure out how to resolve now.